  setCookie: function setCookie(c_name, value, expiredays) {
    var exdate = new Date()
    exdate.setDate(exdate.getDate() + expiredays)
    document.cookie = c_name + "=" + escape(value) +
      ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString())
  }

  getCookie: function getCookie(c_name) {
    if (document.cookie.length > 0) {
      c_start = document.cookie.indexOf(c_name + "=")
      if (c_start != -1) {
        c_start = c_start + c_name.length + 1
        c_end = document.cookie.indexOf(";", c_start)
        if (c_end == -1) c_end = document.cookie.length
        return unescape(document.cookie.substring(c_start, c_end))
      }
    }
    return ""
  }
